lehrer from the university of denver. watch and engage from c-span. the debate isn't 9:00 p.m. after the debate, your reactions, calls, and emails and tweets. >> two texas politicians, each touted as the future of their parties, debated the economy, immigration and other issues at the texas tribune festival in austin. julian castro is the mayor san antonio and was the keynote speaker of this year's democratic national convention. ted crews is republican canada for the u.s. senate. this is one hour. >> i think you know the drill today. i hope you will enjoy as many of those as you can. if you have phones and you're not going to tweet or instagram, we ask you to turn off your phones. please give our sponsors a hand. [applause] we will visit for about 40 minutes. when we get started, there are phones on either i'll. -- either aisle. we ask that of that the microphone at the appropriate -- we ask that you line up at the microphone at the program time than july 31, 2012 began with the announcement that julian caster would be t